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                            <a href="http://getbootstrap.com/docs/4.1/utilities/shadows/">
                                Shadows
                            </a>
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                            <a href="http://getbootstrap.com/docs/4.1/utilities/sizing/">
                                Sizing
                            </a>
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                            <a href="http://getbootstrap.com/docs/4.1/utilities/spacing/">
                                Spacing
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                                Text
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                                Vertical align
                            </a>
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                        <li>
                            <a href="http://getbootstrap.com/docs/4.1/utilities/visibility/">
                                Visibility
                            </a>
                        </li>
                    </ul>
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                <div class="bd-toc-item">
                    <a class="bd-toc-link" href="http://getbootstrap.com/docs/4.1/extend/approach/">
                        Extend
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                        <li>
                            <a href="http://getbootstrap.com/docs/4.1/extend/approach/">
                                Approach
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                                Icons
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                <div class="bd-toc-item">
                    <a class="bd-toc-link" href="http://getbootstrap.com/docs/4.1/migration/">
                        Migration
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                <div class="bd-toc-item">
                    <a class="bd-toc-link" href="http://getbootstrap.com/docs/4.1/about/overview/">
                        About
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                                Overview
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                                Brand
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                                License
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                                Translations
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        </div>
        <div class="d-none d-xl-block col-xl-2 bd-toc">
            <ul class="section-nav">
                <li class="toc-entry toc-h2">
                    <a href="#containers">Containers</a>
                </li>
                <li class="toc-entry toc-h2">
                    <a href="#responsive-breakpoints">Responsive breakpoints</a>
                </li>
                <li class="toc-entry toc-h2">
                    <a href="#z-index">Z-index</a>
                </li>
            </ul>
        </div>
        <main class="col-12 col-md-9 col-xl-8 py-md-3 pl-md-5 bd-content" role="main">
            <h1 class="bd-title" id="content">Overview</h1>
            <p class="bd-lead">Components and options for laying out your Bootstrap project, including wrapping containers, a powerful grid system, a flexible media object, and responsive utility classes.</p>
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            </div>
            <h2 id="containers">
                <div>Containers
                    <a class="anchorjs-link " href="#containers" aria-label="Anchor" data-anchorjs-icon="#" style="padding-left: 0.375em;"></a>
                </div>
            </h2>
            <p>Containers are the most basic layout element in Bootstrap and are
                <strong>required when using our default grid system</strong>. Choose from a responsive, fixed-width container (meaning its
                <code class="highlighter-rouge">max-width</code> changes at each breakpoint) or fluid-width (meaning it’s
                <code class="highlighter-rouge">100%</code> wide all the time).
            </p>
            <p>While containers
                <em>can</em> be nested, most layouts do not require a nested container.
            </p>
            <div class="bd-example">
                <div class="bd-example-container">
                    <div class="bd-example-container-header"></div>
                    <div class="bd-example-container-sidebar"></div>
                    <div class="bd-example-container-body"></div>
                </div>
            </div>
            <div class="bd-clipboard">
                <button class="btn-clipboard" title="" data-original-title="Copy to clipboard">Copy</button>
            </div>
            <figure class="highlight">
																																								<pre>
																																									<code class="language-html" data-lang="html">
																																										<span class="nt">&lt;div</span>
																																										<span class="na">class=</span>
																																										<span class="s">"container"</span>
																																										<span class="nt">&gt;</span>
																																										<span class="c">&lt;!-- Content here --&gt;</span>
																																										<span class="nt">&lt;/div&gt;</span>
																																									</code>
																																								</pre>
            </figure>
            <p>Use
                <code class="highlighter-rouge">.container-fluid</code> for a full width container, spanning the entire width of the viewport.
            </p>
            <div class="bd-example">
                <div class="bd-example-container bd-example-container-fluid">
                    <div class="bd-example-container-header"></div>
                    <div class="bd-example-container-sidebar"></div>
                    <div class="bd-example-container-body"></div>
                </div>
            </div>
            <div class="bd-clipboard">
                <button class="btn-clipboard" title="" data-original-title="Copy to clipboard">Copy</button>
            </div>
            <figure class="highlight">
																																								<pre>
																																									<code class="language-html" data-lang="html">
																																										<span class="nt">&lt;div</span>
																																										<span class="na">class=</span>
																																										<span class="s">"container-fluid"</span>
																																										<span class="nt">&gt;</span>
  ...

																																										<span class="nt">&lt;/div&gt;</span>
																																									</code>
																																								</pre>
            </figure>
            <h2 id="responsive-breakpoints">
                <div>Responsive breakpoints
                    <a class="anchorjs-link " href="#responsive-breakpoints" aria-label="Anchor" data-anchorjs-icon="#" style="padding-left: 0.375em;"></a>
                </div>
            </h2>
            <p>Since Bootstrap is developed to be mobile first, we use a handful of
                <a href="https://developer.mozilla.org/en-US/docs/Web/CSS/Media_Queries/Using_media_queries">media queries</a> to create sensible breakpoints for our layouts and interfaces. These breakpoints are mostly based on minimum viewport widths and allow us to scale up elements as the viewport changes.
            </p>
            <p>Bootstrap primarily uses the following media query ranges—or breakpoints—in our source Sass files for our layout, grid system, and components.</p>
            <div class="bd-clipboard">
                <button class="btn-clipboard" title="" data-original-title="Copy to clipboard">Copy</button>
            </div>
            <figure class="highlight">
																																								<pre>
																																									<code class="language-scss" data-lang="scss">
																																										<span class="c1">// Extra small devices (portrait phones, less than 576px)</span>
																																										<span class="c1">// No media query for `xs` since this is the default in Bootstrap</span>
																																										<span class="c1">// Small devices (landscape phones, 576px and up)</span>
																																										<span class="k">@media</span>
																																										<span class="p">(</span>
																																										<span class="n">min-width</span>
																																										<span class="o">:</span>
																																										<span class="m">576px</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="c1">// Medium devices (tablets, 768px and up)</span>
																																										<span class="k">@media</span>
																																										<span class="p">(</span>
																																										<span class="n">min-width</span>
																																										<span class="o">:</span>
																																										<span class="m">768px</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="c1">// Large devices (desktops, 992px and up)</span>
																																										<span class="k">@media</span>
																																										<span class="p">(</span>
																																										<span class="n">min-width</span>
																																										<span class="o">:</span>
																																										<span class="m">992px</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="c1">// Extra large devices (large desktops, 1200px and up)</span>
																																										<span class="k">@media</span>
																																										<span class="p">(</span>
																																										<span class="n">min-width</span>
																																										<span class="o">:</span>
																																										<span class="m">1200px</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																									</code>
																																								</pre>
            </figure>
            <p>Since we write our source CSS in Sass, all our media queries are available via Sass mixins:</p>
            <div class="bd-clipboard">
                <button class="btn-clipboard" title="" data-original-title="Copy to clipboard">Copy</button>
            </div>
            <figure class="highlight">
																																								<pre>
																																									<code class="language-scss" data-lang="scss">
																																										<span class="c1">// No media query necessary for xs breakpoint as it's effectively `@media (min-width: 0) { ... }`</span>
																																										<span class="k">@include</span>
																																										<span class="nd">media-breakpoint-up</span>
																																										<span class="p">(</span>
																																										<span class="n">sm</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="k">@include</span>
																																										<span class="nd">media-breakpoint-up</span>
																																										<span class="p">(</span>
																																										<span class="n">md</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="k">@include</span>
																																										<span class="nd">media-breakpoint-up</span>
																																										<span class="p">(</span>
																																										<span class="n">lg</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="k">@include</span>
																																										<span class="nd">media-breakpoint-up</span>
																																										<span class="p">(</span>
																																										<span class="n">xl</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="c1">// Example: Hide starting at `min-width: 0`, and then show at the `sm` breakpoint</span>
																																										<span class="nc">.custom-class</span>
																																										<span class="p">{</span>
																																										<span class="nl">display</span>
																																										<span class="p">:</span>
																																										<span class="nb">none</span>
																																										<span class="p">;</span>
																																										<span class="p">}</span>
																																										<span class="k">@include</span>
																																										<span class="nd">media-breakpoint-up</span>
																																										<span class="p">(</span>
																																										<span class="n">sm</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">.custom-class</span>
																																										<span class="p">{</span>
																																										<span class="nl">display</span>
																																										<span class="p">:</span>
																																										<span class="nb">block</span>
																																										<span class="p">;</span>
																																										<span class="p">}</span>
																																										<span class="p">}</span>
																																									</code>
																																								</pre>
            </figure>
            <p>We occasionally use media queries that go in the other direction (the given screen size
                <em>or smaller</em>):
            </p>
            <div class="bd-clipboard">
                <button class="btn-clipboard" title="" data-original-title="Copy to clipboard">Copy</button>
            </div>
            <figure class="highlight">
																																								<pre>
																																									<code class="language-scss" data-lang="scss">
																																										<span class="c1">// Extra small devices (portrait phones, less than 576px)</span>
																																										<span class="k">@media</span>
																																										<span class="p">(</span>
																																										<span class="n">max-width</span>
																																										<span class="o">:</span>
																																										<span class="m">575</span>
																																										<span class="mi">.98px</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="c1">// Small devices (landscape phones, less than 768px)</span>
																																										<span class="k">@media</span>
																																										<span class="p">(</span>
																																										<span class="n">max-width</span>
																																										<span class="o">:</span>
																																										<span class="m">767</span>
																																										<span class="mi">.98px</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="c1">// Medium devices (tablets, less than 992px)</span>
																																										<span class="k">@media</span>
																																										<span class="p">(</span>
																																										<span class="n">max-width</span>
																																										<span class="o">:</span>
																																										<span class="m">991</span>
																																										<span class="mi">.98px</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="c1">// Large devices (desktops, less than 1200px)</span>
																																										<span class="k">@media</span>
																																										<span class="p">(</span>
																																										<span class="n">max-width</span>
																																										<span class="o">:</span>
																																										<span class="m">1199</span>
																																										<span class="mi">.98px</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="c1">// Extra large devices (large desktops)</span>
																																										<span class="c1">// No media query since the extra-large breakpoint has no upper bound on its width</span>
																																									</code>
																																								</pre>
            </figure>
            <div class="bd-callout bd-callout-info">
                <p>Note that since browsers do not currently support
                    <a href="https://www.w3.org/TR/mediaqueries-4/#range-context">range context queries</a>, we work around the limitations of
                    <a href="https://www.w3.org/TR/mediaqueries-4/#mq-min-max">
                        <code class="highlighter-rouge">min-</code> and
                        <code class="highlighter-rouge">max-</code> prefixes
                    </a> and viewports with fractional widths (which can occur under certain conditions on high-dpi devices, for instance) by using values with higher precision for these comparisons.
                </p>
            </div>
            <p>Once again, these media queries are also available via Sass mixins:</p>
            <div class="bd-clipboard">
                <button class="btn-clipboard" title="" data-original-title="Copy to clipboard">Copy</button>
            </div>
            <figure class="highlight">
																																								<pre>
																																									<code class="language-scss" data-lang="scss">
																																										<span class="k">@include</span>
																																										<span class="nd">media-breakpoint-down</span>
																																										<span class="p">(</span>
																																										<span class="n">xs</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="k">@include</span>
																																										<span class="nd">media-breakpoint-down</span>
																																										<span class="p">(</span>
																																										<span class="n">sm</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="k">@include</span>
																																										<span class="nd">media-breakpoint-down</span>
																																										<span class="p">(</span>
																																										<span class="n">md</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="k">@include</span>
																																										<span class="nd">media-breakpoint-down</span>
																																										<span class="p">(</span>
																																										<span class="n">lg</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="c1">// No media query necessary for xl breakpoint as it has no upper bound on its width</span>
																																										<span class="c1">// Example: Style from medium breakpoint and down</span>
																																										<span class="k">@include</span>
																																										<span class="nd">media-breakpoint-down</span>
																																										<span class="p">(</span>
																																										<span class="n">md</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">.custom-class</span>
																																										<span class="p">{</span>
																																										<span class="nl">display</span>
																																										<span class="p">:</span>
																																										<span class="nb">block</span>
																																										<span class="p">;</span>
																																										<span class="p">}</span>
																																										<span class="p">}</span>
																																									</code>
																																								</pre>
            </figure>
            <p>There are also media queries and mixins for targeting a single segment of screen sizes using the minimum and maximum breakpoint widths.</p>
            <div class="bd-clipboard">
                <button class="btn-clipboard" title="" data-original-title="Copy to clipboard">Copy</button>
            </div>
            <figure class="highlight">
																																								<pre>
																																									<code class="language-scss" data-lang="scss">
																																										<span class="c1">// Extra small devices (portrait phones, less than 576px)</span>
																																										<span class="k">@media</span>
																																										<span class="p">(</span>
																																										<span class="n">max-width</span>
																																										<span class="o">:</span>
																																										<span class="m">575</span>
																																										<span class="mi">.98px</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="c1">// Small devices (landscape phones, 576px and up)</span>
																																										<span class="k">@media</span>
																																										<span class="p">(</span>
																																										<span class="n">min-width</span>
																																										<span class="o">:</span>
																																										<span class="m">576px</span>
																																										<span class="p">)</span>
																																										<span class="nf">and</span>
																																										<span class="p">(</span>
																																										<span class="n">max-width</span>
																																										<span class="o">:</span>
																																										<span class="m">767</span>
																																										<span class="mi">.98px</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="c1">// Medium devices (tablets, 768px and up)</span>
																																										<span class="k">@media</span>
																																										<span class="p">(</span>
																																										<span class="n">min-width</span>
																																										<span class="o">:</span>
																																										<span class="m">768px</span>
																																										<span class="p">)</span>
																																										<span class="nf">and</span>
																																										<span class="p">(</span>
																																										<span class="n">max-width</span>
																																										<span class="o">:</span>
																																										<span class="m">991</span>
																																										<span class="mi">.98px</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="c1">// Large devices (desktops, 992px and up)</span>
																																										<span class="k">@media</span>
																																										<span class="p">(</span>
																																										<span class="n">min-width</span>
																																										<span class="o">:</span>
																																										<span class="m">992px</span>
																																										<span class="p">)</span>
																																										<span class="nf">and</span>
																																										<span class="p">(</span>
																																										<span class="n">max-width</span>
																																										<span class="o">:</span>
																																										<span class="m">1199</span>
																																										<span class="mi">.98px</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="c1">// Extra large devices (large desktops, 1200px and up)</span>
																																										<span class="k">@media</span>
																																										<span class="p">(</span>
																																										<span class="n">min-width</span>
																																										<span class="o">:</span>
																																										<span class="m">1200px</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																									</code>
																																								</pre>
            </figure>
            <p>These media queries are also available via Sass mixins:</p>
            <div class="bd-clipboard">
                <button class="btn-clipboard" title="" data-original-title="Copy to clipboard">Copy</button>
            </div>
            <figure class="highlight">
																																								<pre>
																																									<code class="language-scss" data-lang="scss">
																																										<span class="k">@include</span>
																																										<span class="nd">media-breakpoint-only</span>
																																										<span class="p">(</span>
																																										<span class="n">xs</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="k">@include</span>
																																										<span class="nd">media-breakpoint-only</span>
																																										<span class="p">(</span>
																																										<span class="n">sm</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="k">@include</span>
																																										<span class="nd">media-breakpoint-only</span>
																																										<span class="p">(</span>
																																										<span class="n">md</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="k">@include</span>
																																										<span class="nd">media-breakpoint-only</span>
																																										<span class="p">(</span>
																																										<span class="n">lg</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																										<span class="k">@include</span>
																																										<span class="nd">media-breakpoint-only</span>
																																										<span class="p">(</span>
																																										<span class="n">xl</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																									</code>
																																								</pre>
            </figure>
            <p>Similarly, media queries may span multiple breakpoint widths:</p>
            <div class="bd-clipboard">
                <button class="btn-clipboard" title="" data-original-title="Copy to clipboard">Copy</button>
            </div>
            <figure class="highlight">
																																								<pre>
																																									<code class="language-scss" data-lang="scss">
																																										<span class="c1">// Example</span>
																																										<span class="c1">// Apply styles starting from medium devices and up to extra large devices</span>
																																										<span class="k">@media</span>
																																										<span class="p">(</span>
																																										<span class="n">min-width</span>
																																										<span class="o">:</span>
																																										<span class="m">768px</span>
																																										<span class="p">)</span>
																																										<span class="nf">and</span>
																																										<span class="p">(</span>
																																										<span class="n">max-width</span>
																																										<span class="o">:</span>
																																										<span class="m">1199</span>
																																										<span class="mi">.98px</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																									</code>
																																								</pre>
            </figure>
            <p>The Sass mixin for targeting the same screen size range would be:</p>
            <div class="bd-clipboard">
                <button class="btn-clipboard" title="" data-original-title="Copy to clipboard">Copy</button>
            </div>
            <figure class="highlight">
																																								<pre>
																																									<code class="language-scss" data-lang="scss">
																																										<span class="k">@include</span>
																																										<span class="nd">media-breakpoint-between</span>
																																										<span class="p">(</span>
																																										<span class="n">md</span>
																																										<span class="o">,</span>
																																										<span class="n">xl</span>
																																										<span class="p">)</span>
																																										<span class="p">{</span>
																																										<span class="nc">...</span>
																																										<span class="p">}</span>
																																									</code>
																																								</pre>
            </figure>
            <h2 id="z-index">
                <div>Z-index
                    <a class="anchorjs-link " href="#z-index" aria-label="Anchor" data-anchorjs-icon="#" style="padding-left: 0.375em;"></a>
                </div>
            </h2>
            <p>Several Bootstrap components utilize
                <code class="highlighter-rouge">z-index</code>, the CSS property that helps control layout by providing a third axis to arrange content. We utilize a default z-index scale in Bootstrap that’s been designed to properly layer navigation, tooltips and popovers, modals, and more.
            </p>
            <p>These higher values start at an arbitrary number, high and specific enough to ideally avoid conflicts. We need a standard set of these across our layered components—tooltips, popovers, navbars, dropdowns, modals—so we can be reasonably consistent in the behaviors. There’s no reason we couldn’t have used
                <code class="highlighter-rouge">100</code>+ or
                <code class="highlighter-rouge">500</code>+.
            </p>
            <p>We don’t encourage customization of these individual values; should you change one, you likely need to change them all.</p>
            <div class="bd-clipboard">
                <button class="btn-clipboard" title="" data-original-title="Copy to clipboard">Copy</button>
            </div>
            <figure class="highlight">
																																								<pre>
																																									<code class="language-scss" data-lang="scss">
																																										<span class="nv">$zindex-dropdown</span>
																																										<span class="p">:</span>
																																										<span class="m">1000</span>
																																										<span class="o">!</span>
																																										<span class="nb">default</span>
																																										<span class="p">;</span>
																																										<span class="nv">$zindex-sticky</span>
																																										<span class="p">:</span>
																																										<span class="m">1020</span>
																																										<span class="o">!</span>
																																										<span class="nb">default</span>
																																										<span class="p">;</span>
																																										<span class="nv">$zindex-fixed</span>
																																										<span class="p">:</span>
																																										<span class="m">1030</span>
																																										<span class="o">!</span>
																																										<span class="nb">default</span>
																																										<span class="p">;</span>
																																										<span class="nv">$zindex-modal-backdrop</span>
																																										<span class="p">:</span>
																																										<span class="m">1040</span>
																																										<span class="o">!</span>
																																										<span class="nb">default</span>
																																										<span class="p">;</span>
																																										<span class="nv">$zindex-modal</span>
																																										<span class="p">:</span>
																																										<span class="m">1050</span>
																																										<span class="o">!</span>
																																										<span class="nb">default</span>
																																										<span class="p">;</span>
																																										<span class="nv">$zindex-popover</span>
																																										<span class="p">:</span>
																																										<span class="m">1060</span>
																																										<span class="o">!</span>
																																										<span class="nb">default</span>
																																										<span class="p">;</span>
																																										<span class="nv">$zindex-tooltip</span>
																																										<span class="p">:</span>
																																										<span class="m">1070</span>
																																										<span class="o">!</span>
																																										<span class="nb">default</span>
																																										<span class="p">;</span>
																																									</code>
																																								</pre>
            </figure>
            <p>To handle overlapping borders within components (e.g., buttons and inputs in input groups), we use low single digit
                <code class="highlighter-rouge">z-index</code> values of
                <code class="highlighter-rouge">1</code>,
                <code class="highlighter-rouge">2</code>, and
                <code class="highlighter-rouge">3</code> for default, hover, and active states. On hover/focus/active, we bring a particular element to the forefront with a higher
                <code class="highlighter-rouge">z-index</code> value to show their border over the sibling elements.
            </p>
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